Screen for threshing-machines.



No. 667,|68. Patented lan. 29, l90l.

F. W. SORENSON.

SCREEN F08 THBESHING MACHINES.

^ (Application led Maf. 13, 1900.]

(No Model.)

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Ulimlllllrlllmmm! Frederz'drWomnson,

S2/vi t n abou .UNITED v STATES PATENT OFFICE,

.FREDERICK w. soRENsoN, oF BENSON, MINNESOTA.

SCREEN vFon TH Resume-MACHINES.

SPECIFICATIO fornring' Of Letters Patent No. 667,168, dated January 29, 1901.

Y I Application filed March 18, 1900. serial No. 8,524. (No model.)

My invention relates to sieves or screens especially adapted for use in threshing-machines and fanning-mills, but capable of use independently in any situation where a sieve or screencan be used.

The objects of the invention are to provide an improved sieve or screenin -which the meshes may be adjusted to various sizes and shapes to suit'the class of work to be done and tootherwise generally improve the construction of such devices. The diagonalposition of the square openings with cutting edges in their relation to the longitudinal and transverse adjustments gives a shearing 'action in each direction of adjustment;

With these objects in view my invention consists in` the improved construction, arrangements, and combinations of parts hereinafter fullydescribed and afterward specifically pointed-out in the claims.

In the accompanying drawings, Figure lis a perspective view illustrating one adaptavtion of my invention-namely, as an independent mechanism unattached to a machine. Fig. 2 is a longitudinal vertical sectional View of the same. through a frame above the sieve-plates looking downward in onepadj ustment of theplates., Fig. 4 1s a fragmentary plan viewillustratl -ing a portion of the plates in another adjustment. ,Fig 5 is a similar 'View showing a third adjustment. Fig. 6 i's a similar vie'w with the sheets in .theirinormal positions'. Fig. 7 isafragmentarysectional View through a portion of the plates in the position shown in Fig. 4. Fig. 8 is a similar View with the sheets in the position shown in Fig. 3. Fig. 9 is a similar view with the sheets in the position shown in Fig. 5. Fig. 10 is a similar viewwith the sheets in position shown in Fig.

Fig. 3 is a sectional'viewv Like numerals vmark the same parts in all the figures of the drawings.

As previously stated, my invention pertains exclusively to thesconstruction and means for adjusting the sieve-sheets,.a`nd my improved .construction iis-applicable to threshing-machines, fanning-mills, or any other position in which sieves or screens may be used. ln this embodiment of my invention I have illustrated it as forming a part of an iridependent apparatusfor performing the function'ofv sifting or screening only, and in this embodiment, as illustrated, 1v indicates a box mounted upon suitable legs or supports 2 andv provided with a' hopper 3, a dischargevspout 4t at its lower end, a discharge-hopper 5, provided with a sliding door 6, and a hingedoor 7 in its top, the uses of which will be.

manifest and .referred to hereinafter, Isuch Iconstruction forming no part of my invention.

i8, 9, and l0 indicate, respectively, the upper, middle, and lower sheets of my improved sieve or'screen. These sheets are perforated or provided with square holes, the diagonals of which are parallel, respectively, with the sides and ends of theurectangular box or frame in which they'are mounted. The upperand lower plates 8 and 10 are stationary, while the middle plate 9 is adjustable between them both longitudinally and` transversely, thel -a shaft 14, jonrnaled in bearings 15, secured to the frame, such shaft being provided with cranks 16 atits ends, whereby it may be rotated. 4When the shaft is rotated, the plate 9 will be moved longitudinally,`the first movemeut from the position shown in Figs. 6 and" 10 being to that shown in Figsl 4 and 7, the movement being substantially one-half the diagonal length of the holes. In'this adjustmentthe sizes of the holes are reduced to substantially one-fourth of their original size,

thus adapting the complete screen to the usesp holes or openings in all of the plates being of IOO of a screen with such smaller perforations or holes. It will of course be understood that this longitudinal movement may be limited,

so as to decrease vthe size of the holes to any' desired degree between the sizes illustrated in Fig. b and those in Fig. 7. What may be termed the second adjustment is effected by moving the `middle sheet in the same direction beyond the position to which it was moved to bring the parts to the position shown in Fig. 4. This adjustment is illustrated'in Fig. 3 and results in dividing each large hole of the sheet into four small holes, making in effect a screen with Aau extremely fine mesh. What might be termed the third or double 7 adjustment is effected-by first moving the middle sheet longitudinally to about the position for eecting thelirst adjustment, as

illustrated in Fig. 4, and then transversely to ses transversely in the racks, each pinion sliding i'n its rack when the plate is moved by the other pinion. The shaft 2() is.: provided with a crank 22, by means of which it maybe turned to reciprocate the plate 1l laterally.

In sheets 8 and 10 the holes or edges o f the openingsare beveled downward, as shownat 17, so as to present a knife-edge in moving the sheet in either direction. By this means ,any long refuse,- such as straw orlight twigs,

may be cutoi by reciprocating the middle sheet.

It will of course beA understood that the frame in which my'iinproved'sieve' is mounted may be stationaryv 0r movable 0r horizontal or inclined and any ordinary means proesmas' vided, where the' frame is movable, for eecting such movement, such means forming n part of my invention.

In the operation of my invention the sieve j 'will be used in the, same manner in which sieves' of well-known constructions are used, the 4material to be screened being passed into the hopper 3 and discharged through the .spout 4, the material which passes through' the meshes of the sieve being discharged by opening the door 6. f

The simplicity of construction of the plates, which may be made bf any material suitable for such purposes, will enable the sieve to be economically constructed, and by means `oit' theadj ustments -hereinbeforedescribed the range of usefulness of:v a single sieve will be :very greatly extended.

Having thus described the invention, what is claimed, and desired to4 be secured by Letters Patent,1is- 1 i 1.v A sieve comprising three superposed sheets i'n contact with each other, each'sheet provided with square holes set diagonally with reference to the edges of the sheets, the upper and lower sheets being stationary, and means for adjusting the middle sheet longitudinallyand transversely, substantially as and for the purpose described.

2. A sieve comprising three su perpose'd sheets. iu contact with each other, the upper and lower sheets f which are stationary, each sheet being provided with normally-registering holes, those portions of the ltop and bottom sheets which form the edges of the holes being beveled inward to knife-edges, and the 'walls of the holes of the middle sheet being at right angles `io the sheet, in combination with means for adjusting the .middle sheet.

longitudinallyandtransversely,substantially as and forthe purpose described.

In testimony whereof 1 ax my signature in presence of two Witnesses. 5

FREDERICK` W. SORENSON.

Witnesses: o I v JOHN MCSHANE, F. P. O LNEY. 

